ZHCSDZ1E July 2015 – July 2024 TUSB4020BI
PRODUCTION DATA
The TUSB4020BI does not have specific power sequencing requirements with respect to the VDD or VDD33 power rails. The VDD or VDD33 power rails can be powered up for an indefinite period of time while the other is not powered up if all of these constraints are met:
A supply bus is powered up when the voltage is within the recommended operating range. A supply bus is powered down when the supply is below that range, either stable or in transition.
A minimum reset duration of 3ms is required, which is defined as the time when the power supplies are in the recommended operating range to the deassertion of GRSTz. This can be generated using programmable-delay supervisory device or using an RC circuit.